// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_NINE_IMAGE_PAINTER_H_
#define UI_GFX_NINE_IMAGE_PAINTER_H_

#include <stdint.h>

#include <vector>

#include "base/gtest_prod_util.h"
#include "base/logging.h"
#include "base/macros.h"
#include "ui/gfx/gfx_export.h"
#include "ui/gfx/image/image_skia.h"

namespace gfx {

class Canvas;
class Insets;
class Rect;

class GFX_EXPORT NineImagePainter {
public:
    explicit NineImagePainter(const std::vector<ImageSkia>& images);
    NineImagePainter(const ImageSkia& image, const Insets& insets);
    ~NineImagePainter();

    bool IsEmpty() const;
    Size GetMinimumSize() const;
    void Paint(Canvas* canvas, const Rect& bounds);
    void Paint(Canvas* canvas, const Rect& bounds, uint8_t alpha);

private:
    friend class NineImagePainterTest;
    FRIEND_TEST_ALL_PREFIXES(NineImagePainterTest, GetSubsetRegions);

    // Gets the regions for the subimages into |regions|.
    static void GetSubsetRegions(const ImageSkia& image,
        const Insets& insets,
        std::vector<Rect>* regions);

    // Images are numbered as depicted below.
    //  ____________________
    // |__i0__|__i1__|__i2__|
    // |__i3__|__i4__|__i5__|
    // |__i6__|__i7__|__i8__|
    ImageSkia images_[9];

    DISALLOW_COPY_AND_ASSIGN(NineImagePainter);
};

} // namespace gfx

#endif // UI_GFX_NINE_IMAGE_PAINTER_H_
